临床资料一、材料来源:查阅本院门诊从1976年～1986年存档的阻生牙牙片共891张,其中水平阻生牙230例,占25.81%,前倾阻生牙,垂直阻生牙等占74.1%。二、拟定标准:1.阻生牙长轴与邻牙长轴完全垂直方可称为水平阻生牙,其中阻生牙中轴水平线低于邻牙最突径称为低位水平阻生,承受阻力大,反之为高位水平阻生,承受骨阻力小。2.阻生牙与邻牙生理间隙,指的是阻 Clinical data First, the source of material: access to our hospital from 1976 to 1986, a total of 891 pieces of impacted teeth, including horizontal impacted teeth 230 cases, accounting for 25.81%, anterior impacted teeth, vertical impacted teeth Accounting for 74.1%. Second, the proposed standard: 1. Implantation of long axis of teeth and adjacent mandibular long axis can be described as completely horizontal horizontal impacted teeth, including the level of the lower edge of the occlusion tooth lower than the most prominent adjacent teeth known as the low level of resistance, to withstand Resistance, on the contrary for the high level of impaction, to bear the bone resistance. 2. Impacted teeth and adjacent teeth physiological gap, refers to the resistance